Electric-lamp socket



Sept. 27, 1927.

Y N. B. PARSONS ELECTRIC LAMP SOCKET -Filed July 7, 1922 v v fave 24 02 ,MeweZl 5. P07250705; y w lwm M MM Patented Sept. 27, 1927.

UNITED STATES 1,643,641 PATENT OFFICE.

NEWELL B. PARSONS, OFLA GRANGE, ILLINOIS, ASSIGNOR TO BELDEN MANUFACTUR- ING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTRIC-LAMP SOCKET.

Application filed July 7,

This invention relates to sockets or receptacles for incandescent lamps or attaching plugs and has for its primary object to provide an article of this nature which is simple and compact in construction and advant'ageous in use.

Further objects of the invention are to provide a sotket in which the conductors are fully protected and concealed but are readily accessible to permit the attachment of the line wires thereto, to provide a socket which is suitable for dental purposes, and in general to provide a novel and improved socket. The many other objects and advantages will be better understood by reference to the following specification when considered in connection with the accompanying drawing illustrating a selected embodiment thereof, in which:

Fig. l is an elevation of my improved socket completely assembled.

Fig. 2 is an enlarged elevation, partially F in section, with the parts of the socket ready for assembly, and

Fig. 3 is the same as parts assembled.

Fig. 2' with the Referring to the drawing, a tubular shell or sleeve 5 of conducting material such as brass is suitably shaped by pressure so as to provide an inner and outer thread. The inner end portion 6 of this shell or sleeve 5 is contracted to form a throat and beyond the throat a disk 7 of mica or other suitable insulating material and of diameter greater than that of the throat is secured in a short cylindrical extension 6 by forming an internalflange on extension 6 after the disk 7 is inserted. An eyelet passes through this disk substantially centrally thereof and one of the line wires 9 is soldered or otherwise attached thereto at 8. This eyelet forms one of the contact points for the lamp 17. The other line wire is connected at 10 to- 0 the shell 5 preferably by soldering.

The holder or protecting cover for the socket or shell 5 and wiring is formed of vulcanized rubber or other suitable insulating material in two sections or parts 11 and 12 which are interiorly threaded and screwed over opposite ends of the shell 5 in the manner indicated in Fig. 3. The line wires enter the socket through an opening 13 in the 5 end of the part 11 of the holder and a coil spring 14.- of the usual type may be inserted 1922. Serial No. 573,394.

1n this opening to keep the line wires from being bent at a sharp angle. The part 11 is preferably only partially threaded so that the shell 5 can enter therein a limited distance. A contraction 15 at the outer end of the part 12 of the holder prevents the shell 5 from passing out through the opening in this end and insures that no portion of the shell will be exposed.

In assembling the socket the line wires 9 are drawn through the part 11 of the holder and soldered or otherwise attached to the shell 5 in the manner indicated in Fig. 2. This part 11 of the holder is next slid outwardly on the wires 9 and screwed upon the shell to the position indicated in Fig. 3. The part 12 of the holder is now screwed upon the outer end of the shell until its inner end comes into contact with andbinds against the end of the part 11. The socket is now completely assembled and ready to receive the lamp 17 The center contact 18 of the lamp establishes electrical'connection with the line through the medium of the eyelet in the disk 7 against which it presses. The shell 5 forms the other contact for the lamp.

It is obvious from the foregoing description that my improved socket is simple and compact in construction and maybe easily assembled or taken apart. This enables a broken wire to be quickly repaired.

The contraction 15 is small enough to prevent the shell from screwing out of the holder, but is large enough to admit the lamp base which screws into the shell and hence ii considerably smaller in diameter than the s ell.

Although I have illustrated a socket used for directly receiving an ordinary medium sized Edison-base lamp, those skilled in the art will understand that the arrangement may be advantageously employed for miniature lamps such as are used by the medical and dental professions.

I am aware that other changes may be made in the form and arrangement of parts -such as fairly fall within "the scope of the following claims.

I claim as my invent1on:

1. An electric lamp socket comprising a I hollow shell of relatively uniform cross-sectional dimensions from end to end and open at one end to receive a lamp, the other end of said shell being formed with a'reduced extension to receive line connections from a source of power, and a hollow, sectional insulating cover element for receiving the shell each of said sections having an appreciable expanse of exterior surface affording hand grips for assembling the sections on the shell, the adjacent interior portions offl said sections being of substantially the same cross-sectional dimensions as the shell to receive the shell therewithin, and the crosssectional dimensions of the interior portions of said sections at the respective ends of the I cover element for receiving the shell, each of said sections havingan appreciable expanse of exterior surface affording hand grips for assembling the sections on the shell, and said sections adapted to register and abut each other at a point intermediate the length of the shell, the interior dimensions of the sec tions at both ends of the shell being reduced to form abutments to prevent end Wise movement of the shell with respect to the sections so that the sections will be automatically centered on the shell.

3. An electric lamp socket comprising a hollow, cylindrical, exteriorly screwthreaded shell of relatively uniform diameter from end to end and open at one end to receive a lamp, the other end of said shell being formed with a reduced extension to receive line connections from a source of power, and a hollow, cylindrical, interiorly screwthreaded sectional insulating cove'r element for receiving the shell, each of said sections having an appreciable expanse of exterior surface affording hand grips for assembling the sections on the shell, and said sections adapted toregister and abut each other at a point intermediate the length of the shell to frictionally resist relative movement, the interior dimensions of 'the sections at both ends of the shell beingreduced to form abutments to prevent endwlse movement of the shell with respectto the sections so that the sections will be automatically centered on the shell. 4. An electric lamp socket comprising a single exteriorly threaded shell of conducting material havingan'open'end and interior means for receiving and holdin an electric light bulb, and a cover for sai shell comprising two interiorly threaded sections of insulating material each formed to provide hand grips for assembling the sections on the shell, one of said sections being freely open at both ends, and the other section being freely open' at one-end and adapted to receive conductors therethrough for attachment to the shell and to form an insulated contact at the inner end thereof, said sections. when screwed on the shell abutting frictionally at a, point intermediate the length of the shell for retention of the parts in assembled relation, and means for centering the sections on the shell automatically with respect to their position longitudinally thereof.

NEWELL 'B. PARSONS. 

